removing a few bytes when there's a pickling error (#96)

ultrack/core/database.py

@@ -1,5 +1,6 @@
 import enum
 import logging
+import pickle
 from pathlib import Path
 from typing import Any, List, Union
 
@@ -39,7 +40,11 @@ def bind_processor(self, dialect):
         def _process(value):
             if isinstance(value, (bytes, memoryview)):
                 return value
-            return processor(value)
+            try:
+                return processor(value)
+            except pickle.UnpicklingError:
+                # for some reason, when converting database it has a few extra bytes
+                return processor(bytes.fromhex(value[3:].decode("utf-8")))
 
         return _process